west.yml: update BLE stm32wba lib to cube version V1.6.0

Update BLE lib version for STM32WBAxx serie
from version v1.5.0 to version v1.6.0.

Covering both STM32WBA5X and STM32WBA6X

Signed-off-by: Alessandro Manganaro <[email protected]>

Author: asm5878

west.yml

@@ -245,7 +245,7 @@ manifest:
       groups:
         - hal
     - name: hal_stm32
-      revision: 6e4716f8ac2c6e6159a958a836e1dcca06804456
+      revision: pull/280/head
       path: modules/hal/stm32
       groups:
         - hal